[PVE-User] Proxmox + ZFS: Performance issues

[Ralf]

Some Western Digital Green stuff:

[    2.406419] scsi 2:0:0:0: Direct-Access     ATA      WDC WD5000AADS-0
0A01 PQ: 0 ANSI: 5
[    2.406766] sd 2:0:0:0: [sda] 976773168 512-byte logical blocks: (500
GB/466 GiB)
[    2.406794] sd 2:0:0:0: Attached scsi generic sg0 type 0
[    2.406845] sd 2:0:0:0: [sda] Write Protect is off
[    2.406848] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    2.406884] sd 2:0:0:0: [sda] Write cache: disabled, read cache:
enabled, doesn't support DPO or FUA
[    2.407121] scsi 3:0:0:0: Direct-Access     ATA      WDC WD5000AADS-0
0A01 PQ: 0 ANSI: 5
[    2.407342] sd 3:0:0:0: [sdb] 976773168 512-byte logical blocks: (500
GB/466 GiB)
[    2.407417] sd 3:0:0:0: Attached scsi generic sg1 type 0
[    2.407424] sd 3:0:0:0: [sdb] Write Protect is off
[    2.407428] sd 3:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[    2.407459] sd 3:0:0:0: [sdb] Write cache: disabled, read cache:
enabled, doesn't support DPO or FUA

According to google, that's a Western Digital Green 500GB, S-ATA 300,
32MiB Cache

  Ralf


On 04/24/2016 08:57 PM, Christian Kivalo wrote:
>
> Am 24. April 2016 19:51:21 MESZ, schrieb Ralf <ralf+pve at ramses-pyramidenbau.de>:
>> Hi,
>>
>> zil.. That's an additional ZFS cache, right?
>> Shouldn't it be slightly faster, even without additional caches?
> The ZIL is used for writes. Not for reads.
>
> That will not help with your slow reads.
>
> It should be faster even without caches.
>
> What drives are you using?
>