diff --git a/docs/config/client.en.md b/docs/config/client.en.md
index 3673bd86..332f9c17 100644
--- a/docs/config/client.en.md
+++ b/docs/config/client.en.md
@@ -13,6 +13,7 @@ affect their interaction with the cluster.
 - [client_retry_interval](#client_retry_interval)
 - [client_eio_retry_interval](#client_eio_retry_interval)
 - [client_retry_enospc](#client_retry_enospc)
+- [client_wait_up_timeout](#client_wait_up_timeout)
 - [client_max_dirty_bytes](#client_max_dirty_bytes)
 - [client_max_dirty_ops](#client_max_dirty_ops)
 - [client_enable_writeback](#client_enable_writeback)
@@ -70,6 +71,19 @@ and clients are not blocked and just get EIO error code instead.
 Retry writes on out of space errors to wait until some space is freed on
 OSDs.
 
+## client_wait_up_timeout
+
+- Type: seconds
+- Default: 16
+- Can be changed online: yes
+
+Wait for this number of seconds until PGs are up when doing operations
+which require all PGs to be up. Currently only used by object listings
+in delete and merge-based commands ([vitastor-cli rm](../usage/cli.en.md#rm), merge and so on).
+
+The default value is calculated as `1 + OSD lease timeout`, which is
+`1 + etcd_report_interval + max_etcd_attempts*2*etcd_quick_timeout`.
+
 ## client_max_dirty_bytes
 
 - Type: integer
diff --git a/docs/config/client.ru.md b/docs/config/client.ru.md
index e941e642..4357cbc7 100644
--- a/docs/config/client.ru.md
+++ b/docs/config/client.ru.md
@@ -13,6 +13,7 @@
 - [client_retry_interval](#client_retry_interval)
 - [client_eio_retry_interval](#client_eio_retry_interval)
 - [client_retry_enospc](#client_retry_enospc)
+- [client_wait_up_timeout](#client_wait_up_timeout)
 - [client_max_dirty_bytes](#client_max_dirty_bytes)
 - [client_max_dirty_ops](#client_max_dirty_ops)
 - [client_enable_writeback](#client_enable_writeback)
@@ -72,6 +73,19 @@ RDMA и хотите повысить пиковую производитель
 Повторять запросы записи, завершившиеся с ошибками нехватки места, т.е.
 ожидать, пока на OSD не освободится место.
 
+## client_wait_up_timeout
+
+- Тип: секунды
+- Значение по умолчанию: 16
+- Можно менять на лету: да
+
+Время ожидания поднятия PG при операциях, требующих активности всех PG.
+В данный момент используется листингами объектов в командах, использующих
+удаление и слияние ([vitastor-cli rm](../usage/cli.ru.md#rm), merge и подобные).
+
+Значение по умолчанию вычисляется как `1 + время lease OSD`, равное
+`1 + etcd_report_interval + max_etcd_attempts*2*etcd_quick_timeout`.
+
 ## client_max_dirty_bytes
 
 - Тип: целое число
diff --git a/docs/config/osd.en.md b/docs/config/osd.en.md
index 9fda3ff9..d762206a 100644
--- a/docs/config/osd.en.md
+++ b/docs/config/osd.en.md
@@ -316,7 +316,7 @@ for hot data and slower disks - HDDs and maybe SATA SSDs - but will slightly
 decrease write performance for fast disks because page cache is an overhead
 itself.
 
-Choose "directsync" to use [immediate_commit](layout-cluster.ru.md#immediate_commit)
+Choose "directsync" to use [immediate_commit](layout-cluster.en.md#immediate_commit)
 (which requires disable_data_fsync) with drives having write-back cache
 which can't be turned off, for example, Intel Optane. Also note that *some*
 desktop SSDs (for example, HP EX950) may ignore O_SYNC thus making
diff --git a/docs/config/pool.en.md b/docs/config/pool.en.md
index 16a032b2..fa34665a 100644
--- a/docs/config/pool.en.md
+++ b/docs/config/pool.en.md
@@ -43,7 +43,7 @@ Parameters:
 - [osd_tags](#osd_tags)
 - [primary_affinity_tags](#primary_affinity_tags)
 - [scrub_interval](#scrub_interval)
-- [used_for_fs](#used_for_fs)
+- [used_for_app](#used_for_app)
 
 Examples:
 
@@ -377,24 +377,37 @@ of the OSDs containing a data chunk for a PG.
 Automatic scrubbing interval for this pool. Overrides
 [global scrub_interval setting](osd.en.md#scrub_interval).
 
-## used_for_fs
+## used_for_app
 
 - Type: string
 
-If non-empty, the pool is marked as used for VitastorFS with metadata stored
-in block image (regular Vitastor volume) named as the value of this pool parameter.
+If non-empty, the pool is marked as used for a separate application, for example,
+VitastorFS or S3, which allocates Vitastor volume IDs by itself and does not use
+image/inode metadata in etcd.
 
-When a pool is marked as used for VitastorFS, regular block volume creation in it
+When a pool is marked as used for such app, regular block volume creation in it
 is disabled (vitastor-cli refuses to create images without --force) to protect
-the user from block volume and FS file ID collisions and data loss.
+the user from block volume and FS/S3 volume ID collisions and data loss.
 
-[vitastor-nfs](../usage/nfs.ru.md), in its turn, refuses to use pools not marked
+Also such pools do not calculate per-inode space usage statistics in etcd because
+using it for an external application implies that it may contain a very large
+number of volumes and their statistics may take too much space in etcd.
+
+Setting used_for_app to `fs:<name>` tells Vitastor that the pool is used for VitastorFS
+with VitastorKV metadata base stored in a block image (regular Vitastor volume) named
+`<name>`.
+
+[vitastor-nfs](../usage/nfs.en.md), in its turn, refuses to use pools not marked
 for the corresponding FS when starting. This also implies that you can use one
 pool only for one VitastorFS.
 
-The second thing that is disabled for VitastorFS pools is reporting per-inode space
-usage statistics in etcd because a FS pool may store a very large number of files
-and statistics for them all would take a lot of space in etcd.
+If you plan to use the pool for S3, set its used_for_app to `s3:<name>`. `<name>` may
+be basically anything you want (for example, `s3:standard`) - it's not validated
+by Vitastor S3 components in any way.
+
+All other values except prefixed with `fs:` or `s3:` may be used freely and don't
+mean anything special for Vitastor core components. For now, you can use them as
+you wish.
 
 # Examples
 
diff --git a/docs/config/pool.ru.md b/docs/config/pool.ru.md
index 3a68d199..d7557ceb 100644
--- a/docs/config/pool.ru.md
+++ b/docs/config/pool.ru.md
@@ -42,7 +42,7 @@
 - [osd_tags](#osd_tags)
 - [primary_affinity_tags](#primary_affinity_tags)
 - [scrub_interval](#scrub_interval)
-- [used_for_fs](#used_for_fs)
+- [used_for_app](#used_for_app)
 
 Примеры:
 
@@ -256,7 +256,7 @@ PG в Vitastor эферемерны, то есть вы можете менят
 
 ## raw_placement
 
-- Type: string
+- Тип: строка
 
 Низкоуровневые правила генерации PG в форме DSL (доменно-специфичного языка).
 Используйте, только если действительно знаете, зачем вам это надо :)
@@ -383,26 +383,39 @@ OSD с "all".
 Интервал скраба, то есть, автоматической фоновой проверки данных для данного пула.
 Переопределяет [глобальную настройку scrub_interval](osd.ru.md#scrub_interval).
 
-## used_for_fs
+## used_for_app
 
-- Type: string
+- Тип: строка
 
-Если непусто, пул помечается как используемый для файловой системы VitastorFS с
-метаданными, хранимыми в блочном образе Vitastor с именем, равным значению
-этого параметра.
+Если непусто, пул помечается как используемый для отдельного приложения, например,
+для VitastorFS или S3, которое распределяет ID образов в пуле само и не использует
+метаданные образов/инодов в etcd.
 
-Когда пул помечается как используемый для VitastorFS, создание обычных блочных
-образов в нём отключается (vitastor-cli отказывается создавать образы без --force),
-чтобы защитить пользователя от коллизий ID файлов и блочных образов и, таким
-образом, от потери данных.
+Когда пул помечается используемым для такого приложения, создание обычных блочных
+образов в нём запрещается (vitastor-cli отказывается создавать образы без --force),
+чтобы защитить пользователя от коллизий ID блочных образов и томов ФС/S3, и,
+таким образом, от потери данных.
+
+Также для таких пулов отключается передача статистики в etcd по отдельным инодам,
+так как использование для внешнего приложения подразумевает, что пул может содержать
+очень много томов и их статистика может занять слишком много места в etcd.
+
+Установка used_for_app в значение `fs:<name>` сообщает о том, что пул используется
+для VitastorFS с базой метаданных VitastorKV, хранимой в блочном образе с именем
+`<name>`.
 
 [vitastor-nfs](../usage/nfs.ru.md), в свою очередь, при запуске отказывается
-использовать для ФС пулы, не выделенные для неё. Это также означает, что один
-пул может использоваться только для одной VitastorFS.
+использовать для ФС пулы, не помеченные, как используемые для неё. Это также
+означает, что один пул может использоваться только для одной VitastorFS.
 
-Также для ФС-пулов отключается передача статистики в etcd по отдельным инодам,
-так как ФС-пул может содержать очень много файлов и статистика по ним всем
-заняла бы очень много места в etcd.
+Если же вы планируете использовать пул для данных S3, установите его used_for_app
+в значение `s3:<name>`, где `<name>` - любое название по вашему усмотрению
+(например, `s3:standard`) - конкретное содержимое `<name>` пока никак не проверяется
+компонентами Vitastor S3.
+
+Все остальные значения used_for_app, кроме начинающихся на `fs:` или `s3:`, не
+означают ничего особенного для основных компонентов Vitastor. Поэтому сейчас вы
+можете использовать их свободно любым желаемым способом.
 
 # Примеры
 
diff --git a/docs/config/src/osd.yml b/docs/config/src/osd.yml
index 93d0e266..24206fa1 100644
--- a/docs/config/src/osd.yml
+++ b/docs/config/src/osd.yml
@@ -315,7 +315,7 @@
     decrease write performance for fast disks because page cache is an overhead
     itself.
 
-    Choose "directsync" to use [immediate_commit](layout-cluster.ru.md#immediate_commit)
+    Choose "directsync" to use [immediate_commit](layout-cluster.en.md#immediate_commit)
     (which requires disable_data_fsync) with drives having write-back cache
     which can't be turned off, for example, Intel Optane. Also note that *some*
     desktop SSDs (for example, HP EX950) may ignore O_SYNC thus making
diff --git a/docs/usage/cli.en.md b/docs/usage/cli.en.md
index d84d620a..e304bea3 100644
--- a/docs/usage/cli.en.md
+++ b/docs/usage/cli.en.md
@@ -398,7 +398,8 @@ Optional parameters:
 | `--raw_placement <rules>`      | Specify raw PG generation rules ([details](../config/pool.en.md#raw_placement)) |
 | `--primary_affinity_tags tags` | Prefer to put primary copies on OSDs with all specified tags               |
 | `--scrub_interval <time>`      | Enable regular scrubbing for this pool. Format: number + unit s/m/h/d/M/y  |
-| `--used_for_fs <name>`         | Mark pool as used for VitastorFS with metadata in image <name>             |
+| `--used_for_app fs:<name>`     | Mark pool as used for VitastorFS with metadata in image `<name>`           |
+| `--used_for_app s3:<name>`     | Mark pool as used for S3 location with name `<name>`                       |
 | `--pg_stripe_size <number>`    | Increase object grouping stripe                                            |
 | `--max_osd_combinations 10000` | Maximum number of random combinations for LP solver input                  |
 | `--wait`                       | Wait for the new pool to come online                                       |
diff --git a/docs/usage/nfs.en.md b/docs/usage/nfs.en.md
index fbe9ce08..57873fc4 100644
--- a/docs/usage/nfs.en.md
+++ b/docs/usage/nfs.en.md
@@ -58,7 +58,7 @@ To use VitastorFS:
 2. Create an image for FS metadata, preferably in a faster (SSD or replica-HDD) pool,
    but you can create it in the data pool too if you want (image size doesn't matter):
    `vitastor-cli create -s 10G -p fastpool testfs`
-3. Mark data pool as an FS pool: `vitastor-cli modify-pool --used-for-fs testfs data-pool`
+3. Mark data pool as an FS pool: `vitastor-cli modify-pool --used-for-app fs:testfs data-pool`
 4. Either mount the FS: `vitastor-nfs mount --fs testfs --pool data-pool /mnt/vita`
 5. Or start the NFS server: `vitastor-nfs start --fs testfs --pool data-pool`
 
diff --git a/docs/usage/nfs.ru.md b/docs/usage/nfs.ru.md
index 5f3b65f6..9e57d651 100644
--- a/docs/usage/nfs.ru.md
+++ b/docs/usage/nfs.ru.md
@@ -60,7 +60,7 @@ JSON-формате :-). Для инспекции содержимого БД 
    или по крайней мере на HDD, но без EC), но можно и в том же пуле, что данные
    (размер образа значения не имеет):
    `vitastor-cli create -s 10G -p fastpool testfs`
-3. Пометьте пул данных как ФС-пул: `vitastor-cli modify-pool --used-for-fs testfs data-pool`
+3. Пометьте пул данных как ФС-пул: `vitastor-cli modify-pool --used-for-app fs:testfs data-pool`
 4. Либо примонтируйте ФС: `vitastor-nfs mount --fs testfs --pool data-pool /mnt/vita`
 5. Либо запустите сетевой NFS-сервер: `vitastor-nfs start --fs testfs --pool data-pool`
 
diff --git a/src/client/etcd_state_client.cpp b/src/client/etcd_state_client.cpp
index 92b2143f..5d0db9f4 100644
--- a/src/client/etcd_state_client.cpp
+++ b/src/client/etcd_state_client.cpp
@@ -889,7 +889,11 @@ void etcd_state_client_t::parse_state(const etcd_kv_t & kv)
             if (!pc.scrub_interval)
                 pc.scrub_interval = 0;
             // Mark pool as VitastorFS pool (disable per-inode stats and block volume creation)
-            pc.used_for_fs = pool_item.second["used_for_fs"].as_string();
+            pc.used_for_app = pool_item.second["used_for_fs"].as_string();
+            if (pc.used_for_app != "")
+                pc.used_for_app = "fs:"+pc.used_for_app;
+            else
+                pc.used_for_app = pool_item.second["used_for_app"].as_string();
             // Immediate Commit Mode
             pc.immediate_commit = pool_item.second["immediate_commit"].is_string()
                 ? parse_immediate_commit(pool_item.second["immediate_commit"].string_value(), IMMEDIATE_ALL)
diff --git a/src/client/etcd_state_client.h b/src/client/etcd_state_client.h
index 46cadeed..71716041 100644
--- a/src/client/etcd_state_client.h
+++ b/src/client/etcd_state_client.h
@@ -61,7 +61,7 @@ struct pool_config_t
     uint64_t pg_stripe_size;
     std::map<pg_num_t, pg_config_t> pg_config;
     uint64_t scrub_interval;
-    std::string used_for_fs;
+    std::string used_for_app;
     int backfillfull;
 };
 
diff --git a/src/cmd/cli.cpp b/src/cmd/cli.cpp
index 170a519a..001706d9 100644
--- a/src/cmd/cli.cpp
+++ b/src/cmd/cli.cpp
@@ -186,7 +186,8 @@ static const char* help_text =
     "    --raw_placement <rules>       Specify raw PG generation rules (see documentation for details)\n"
     "    --primary_affinity_tags tags  Prefer to put primary copies on OSDs with all specified tags\n"
     "    --scrub_interval <time>       Enable regular scrubbing for this pool. Format: number + unit s/m/h/d/M/y\n"
-    "    --used_for_fs <name>          Mark pool as used for VitastorFS with metadata in image <name>\n"
+    "    --used_for_app fs:<name>      Mark pool as used for VitastorFS with metadata in image <name>\n"
+    "    --used_for_app s3:<name>      Mark pool as used for S3 location with name <name>\n"
     "    --pg_stripe_size <number>     Increase object grouping stripe\n"
     "    --max_osd_combinations 10000  Maximum number of random combinations for LP solver input\n"
     "    --wait                        Wait for the new pool to come online\n"
@@ -198,7 +199,7 @@ static const char* help_text =
     "vitastor-cli modify-pool|pool-modify <id|name> [--name <new_name>] [PARAMETERS...]\n"
     "  Modify an existing pool. Modifiable parameters:\n"
     "    [-s|--pg_size <number>] [--pg_minsize <number>] [-n|--pg_count <count>]\n"
-    "    [--failure_domain <level>] [--root_node <node>] [--osd_tags <tags>] [--used_for_fs <name>]\n"
+    "    [--failure_domain <level>] [--root_node <node>] [--osd_tags <tags>] [--used_for_app <type>:<name>]\n"
     "    [--max_osd_combinations <number>] [--primary_affinity_tags <tags>] [--scrub_interval <time>]\n"
     "    [--level_placement <rules>] [--raw_placement <rules>]\n"
     "  Non-modifiable parameters (changing them WILL lead to data loss):\n"
diff --git a/src/cmd/cli_create.cpp b/src/cmd/cli_create.cpp
index 86224870..e9e94719 100644
--- a/src/cmd/cli_create.cpp
+++ b/src/cmd/cli_create.cpp
@@ -92,12 +92,12 @@ struct image_creator_t
         {
             new_pool_id = pools.begin()->first;
         }
-        if (new_pool_id && !pools.at(new_pool_id).used_for_fs.empty() && !force)
+        if (new_pool_id && !pools.at(new_pool_id).used_for_app.empty() && !force)
         {
             result = (cli_result_t){
                 .err = EINVAL,
                 .text = "Pool "+pools.at(new_pool_id).name+
-                    " is used for VitastorFS "+pools.at(new_pool_id).used_for_fs+
+                    " is used for application "+pools.at(new_pool_id).used_for_app+
                     ". Use --force if you really know what you are doing",
             };
             state = 100;
diff --git a/src/cmd/cli_pool_cfg.cpp b/src/cmd/cli_pool_cfg.cpp
index 2207d4c9..3310b927 100644
--- a/src/cmd/cli_pool_cfg.cpp
+++ b/src/cmd/cli_pool_cfg.cpp
@@ -90,8 +90,8 @@ std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json ol
             value = sz;
         }
         else if (key == "name" || key == "scheme" || key == "immediate_commit" ||
-            key == "failure_domain" || key == "root_node" || key == "scrub_interval" || key == "used_for_fs" ||
-            key == "raw_placement")
+            key == "failure_domain" || key == "root_node" || key == "scrub_interval" || key == "used_for_app" ||
+            key == "used_for_fs" || key == "raw_placement")
         {
             if (!value.is_string())
             {
@@ -156,8 +156,13 @@ std::string validate_pool_config(json11::Json::object & new_cfg, json11::Json ol
     {
         new_cfg.erase("parity_chunks");
     }
-    if (new_cfg.find("used_for_fs") != new_cfg.end() && new_cfg["used_for_fs"].string_value() == "")
+    if (new_cfg.find("used_for_app") != new_cfg.end() && new_cfg["used_for_app"].string_value() == "")
     {
+        new_cfg.erase("used_for_app");
+    }
+    if (new_cfg.find("used_for_app") == new_cfg.end() && new_cfg.find("used_for_fs") != new_cfg.end())
+    {
+        new_cfg["used_for_app"] = "fs:"+new_cfg["used_for_fs"].string_value();
         new_cfg.erase("used_for_fs");
     }
 
diff --git a/src/cmd/cli_pool_ls.cpp b/src/cmd/cli_pool_ls.cpp
index 233d5b84..7a1efb7a 100644
--- a/src/cmd/cli_pool_ls.cpp
+++ b/src/cmd/cli_pool_ls.cpp
@@ -199,7 +199,9 @@ resume_1:
             auto & st = pool_stats[pool_id];
             for (auto & kv: pp.second.object_items())
             {
-                if (st.find(kv.first) == st.end())
+                if (kv.first == "used_for_fs" && st.find("used_for_app") == st.end())
+                    st["used_for_app"] = "fs:"+kv.second.string_value();
+                else if (st.find(kv.first) == st.end())
                     st[kv.first] = kv.second;
             }
         }
@@ -493,7 +495,7 @@ resume_3:
                 { "name", "Name" },
                 { "id", "ID" },
                 { "scheme_name", "Scheme" },
-                { "used_for_fs", "Used for VitastorFS" },
+                { "used_for_app", "Used for app" },
                 { "status", "Status" },
                 { "backfillfull_fmt", "Backfillfull" },
                 { "pg_count_fmt", "PGs" },
diff --git a/src/cmd/cli_pool_modify.cpp b/src/cmd/cli_pool_modify.cpp
index dfb82ead..f810b1c0 100644
--- a/src/cmd/cli_pool_modify.cpp
+++ b/src/cmd/cli_pool_modify.cpp
@@ -112,19 +112,21 @@ resume_1:
                 return;
             }
 
-            if (new_cfg.find("used_for_fs") != new_cfg.end() && !force)
+            if (new_cfg.find("used_for_app") != new_cfg.end() && !force)
             {
                 // Check that pool doesn't have images
                 auto img_it = parent->cli->st_cli.inode_config.lower_bound(INODE_WITH_POOL(pool_id, 0));
-                if (img_it != parent->cli->st_cli.inode_config.end() && INODE_POOL(img_it->first) == pool_id &&
-                    img_it->second.name == new_cfg["used_for_fs"].string_value())
+                if (img_it != parent->cli->st_cli.inode_config.end() &&
+                    INODE_POOL(img_it->first) == pool_id &&
+                    new_cfg["used_for_app"].string_value().substr(0, 3) == "fs:" &&
+                    img_it->second.name == new_cfg["used_for_app"].string_value().substr(3))
                 {
                     // Only allow metadata image to exist in the FS pool
                     img_it++;
                 }
                 if (img_it != parent->cli->st_cli.inode_config.end() && INODE_POOL(img_it->first) == pool_id)
                 {
-                    result = (cli_result_t){ .err = ENOENT, .text = "Pool "+pool_name+" has block images, delete them before using it for VitastorFS" };
+                    result = (cli_result_t){ .err = ENOENT, .text = "Pool "+pool_name+" has block images, delete them before using it for VitastorFS, S3 or another app" };
                     state = 100;
                     return;
                 }
diff --git a/src/nfs/nfs_kv.cpp b/src/nfs/nfs_kv.cpp
index 44e4b155..dc0b58c7 100644
--- a/src/nfs/nfs_kv.cpp
+++ b/src/nfs/nfs_kv.cpp
@@ -245,10 +245,10 @@ void kv_fs_state_t::init(nfs_proxy_t *proxy, json11::Json cfg)
     if (proxy->cli->st_cli.inode_config.find(fs_kv_inode) != proxy->cli->st_cli.inode_config.end())
     {
         auto & name = proxy->cli->st_cli.inode_config.at(fs_kv_inode).name;
-        if (pool_cfg.used_for_fs != name)
+        if (pool_cfg.used_for_app != "fs:"+name)
         {
-            fprintf(stderr, "Please mark pool as used for this file system with `vitastor-cli modify-pool --used-for-fs %s %s`\n",
-                name.c_str(), cfg["fs"].string_value().c_str());
+            fprintf(stderr, "Please mark pool as used for this file system with `vitastor-cli modify-pool --used-for-app fs:%s %s`\n",
+                name.c_str(), pool_cfg.name.c_str());
             exit(1);
         }
     }
diff --git a/src/osd/osd_cluster.cpp b/src/osd/osd_cluster.cpp
index 84c6e235..a9354a43 100644
--- a/src/osd/osd_cluster.cpp
+++ b/src/osd/osd_cluster.cpp
@@ -673,7 +673,7 @@ void osd_t::apply_no_inode_stats()
     std::vector<uint64_t> no_inode_stats;
     for (auto & pool_item: st_cli.pool_config)
     {
-        if (!pool_item.second.used_for_fs.empty())
+        if (!pool_item.second.used_for_app.empty())
         {
             no_inode_stats.push_back(pool_item.first);
         }
diff --git a/tests/test_nfs.sh b/tests/test_nfs.sh
index c5f87ef4..4663903a 100755
--- a/tests/test_nfs.sh
+++ b/tests/test_nfs.sh
@@ -4,7 +4,7 @@ PG_COUNT=16
 . `dirname $0`/run_3osds.sh
 
 build/src/cmd/vitastor-cli --etcd_address $ETCD_URL create -s 10G fsmeta
-build/src/cmd/vitastor-cli --etcd_address $ETCD_URL modify-pool --used-for-fs fsmeta testpool
+build/src/cmd/vitastor-cli --etcd_address $ETCD_URL modify-pool --used-for-app fs:fsmeta testpool
 build/src/nfs/vitastor-nfs start --fs fsmeta --etcd_address $ETCD_URL --portmap 0 --port 2050 --foreground 1 --trace 1 >>./testdata/nfs.log 2>&1 &
 NFS_PID=$!